[Treatment of Congenital Ulnar Impingement Syndrome by Corrective Osteotomy of the Distal Radius - Clinical Results].

Background: In 2016, a new method was described to treat the painful impingement syndrome of the DRUJ: decompression corrective osteotomy of the distal radius. Clinical symptoms are based on a positive compression test; pain occurs with weight-bearing on the forearm. This phenomenon is seen in conjunction with a deformed sigmoid notch together with ulna minus-variance, which leads to increased tension in the distal oblique bundle of the interosseous membrane. The etiology of the condition can be either congenital, post-traumatic, or iatrogenic. Through the proposed osteotomy, decompression in the DRUJ is achieved. This study summarises the results of these surgical procedures performed in our hand centre exclusively in cases of congenital origin.

Patients und methods: Remodelling of the DRUJ is achieved through the shortening of the distal radius together with closed wedge osteotomy. Relief of the interosseous membrane is accomplished by ulnar translation of the radial shaft. This study only included patients with congenital incongruency in the DRUJ. The results were evaluated using a visual analogue scale (VAS) and the Krimmer Wrist Score and by measuring the preoperative and postoperative range of motion as well as grip strength.

Results: Within 11 years, 45 procedures were performed with our method on 38 patients, of which 17 were treated on the right side, 14 on the left side, and 7 bilaterally. In cases of bilateral incongruency, only the symptomatic side was treated. The statistical evaluation showed a significant reduction of pain on the VAS from 7.2 to 2 (p<0.001). No significant changes were seen in the range of motion (p=0.812). The Krimmer Wrist Score showed good to excellent results in almost 90% of cases.

Conclusion: If the indication criteria are met, contraindications are avoided and the osteotomy is correctly performed, this technique leads to an improvement of patients' functionality and quality of life. From a preventive viewpoint, the influence on the progression of the degenerative changes is yet to be demonstrated in further studies. At any rate, this is a safe procedure, which leaves the path open for other possible options.